bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

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Hi,

Here is a new user option to make DocView, with SVG backend, honor the
current theme colors.


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From c8bf763dc0392ef9059044ff724aca825cd450be Mon Sep 17 00:00:00 2001
From: Manuel Giraud <manuel@ledu-giraud.fr>
Date: Sun, 26 Feb 2023 16:25:17 +0100
Subject: [PATCH] New user option 'doc-view-svg-honor-theme'

* lisp/doc-view.el (doc-view-svg-honor-theme): New user option
that makes SVG in DocView to follow the current theme.
(doc-view-insert-image): Use it.
---
 etc/NEWS         |  8 ++++++++
 lisp/doc-view.el | 19 +++++++++++++++----
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 4b0e4e6bd46..ea8297f932e 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -192,6 +192,14 @@ This command adds a docstring comment to the current defun.  If a
 comment already exists, point is only moved to the comment.  It is
 bound to 'C-c C-d' in 'go-ts-mode'.
 
+** DocView
+
+---
+*** New user option 'doc-view-svg-honor-theme'
+When set to non-nil, this option tells DocView to follow the current
+theme background and foreground colors instead of
+'doc-view-svg-background' and 'doc-view-svg-foreground'.
+
 \f
 * New Modes and Packages in Emacs 30.1
 
diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index 0303fec67a6..5d2348a023f 100644
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -237,17 +237,25 @@ doc-view-imenu-flatten
   :version "29.1")
 
 (defcustom doc-view-svg-background "white"
-  "Background color for svg images.
+  "Background color for svg images.  This is bypassed if
+`doc-view-svg-honor-theme' is non-nil.
 See `doc-view-mupdf-use-svg'."
   :type 'color
   :version "29.1")
 
 (defcustom doc-view-svg-foreground "black"
-  "Foreground color for svg images.
+  "Foreground color for svg images.  This is bypassed if
+`doc-view-svg-honor-theme' is non-nil.
 See `doc-view-mupdf-use-svg'."
   :type 'color
   :version "29.1")
 
+(defcustom doc-view-svg-honor-theme nil
+  "Does SVG foreground and background color honor the current
+theme."
+  :type 'boolean
+  :version "30.1")
+
 (defcustom doc-view-ghostscript-options
   '("-dSAFER" ;; Avoid security problems when rendering files from untrusted
     ;; sources.
@@ -1602,8 +1610,11 @@ doc-view-insert-image
                           (unless (member :transform-smoothing args)
                             (setq args `(,@args :transform-smoothing t)))
                           (when (eq doc-view--image-type 'svg)
-                            (setq args `(,@args :background ,doc-view-svg-background
-                                               :foreground ,doc-view-svg-foreground)))
+                            (if doc-view-svg-honor-theme
+                                (setq args `(,@args :background ,(face-background 'default)
+                                                    :foreground ,(face-foreground 'default)))
+                              (setq args `(,@args :background ,doc-view-svg-background
+                                                  :foreground ,doc-view-svg-foreground))))
 			  (apply #'create-image file doc-view--image-type nil args))))
 	     (slice (doc-view-current-slice))
 	     (img-width (and image (car (image-size image))))
-- 
2.39.1


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In GNU Emacs 30.0.50 (build 1, x86_64-unknown-openbsd7.2, cairo version
 1.17.8) of 2023-02-25 built on computer
Repository revision: 50b55656b9c5ce0d7940bec245f2d9725378d0a0
Repository branch: mgi/image-dired-sha1-content
Windowing system distributor 'The X.Org Foundation', version 11.0.12101006
System Description: OpenBSD computer 7.2 GENERIC.MP#1052 amd64

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-- 
Manuel Giraud

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Eli Zaretskii]

> Date: Sun, 26 Feb 2023 16:33:02 +0100
> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Here is a new user option to make DocView, with SVG backend, honor the
> current theme colors.

I have nothing against the feature, but wouldn't it be better to
modify DocView to use faces for this, and then themes could override
those faces?

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Sun, 26 Feb 2023 16:33:02 +0100
>> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> 
>> Here is a new user option to make DocView, with SVG backend, honor the
>> current theme colors.
>
> I have nothing against the feature, but wouldn't it be better to
> modify DocView to use faces for this, and then themes could override
> those faces?

Why not but I have two issues with this:

    - we had to set those new faces in every Emacs' themes and also wait
      for any theme maker to use them
      
    - those are really just two colors not real faces as the rendering
      is controlled by an external tool anyway
-- 
Manuel Giraud

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 61816@debbugs.gnu.org
> Date: Thu, 02 Mar 2023 14:12:43 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Date: Sun, 26 Feb 2023 16:33:02 +0100
> >> From:  Manuel Giraud via "Bug reports for GNU Emacs,
> >>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> >> 
> >> Here is a new user option to make DocView, with SVG backend, honor the
> >> current theme colors.
> >
> > I have nothing against the feature, but wouldn't it be better to
> > modify DocView to use faces for this, and then themes could override
> > those faces?
> 
> Why not but I have two issues with this:
> 
>     - we had to set those new faces in every Emacs' themes and also wait
>       for any theme maker to use them
>       
>     - those are really just two colors not real faces as the rendering
>       is controlled by an external tool anyway

You are right, of course.  It just feels strange to need to cater to
themes in a core package, when the way themes are supposed to
customize Emacs exists and can be used in this case as well.

Alternatively, maybe themes should have settings for features such as
this one?

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

[...]

> You are right, of course.  It just feels strange to need to cater to
> themes in a core package, when the way themes are supposed to
> customize Emacs exists and can be used in this case as well.
>
> Alternatively, maybe themes should have settings for features such as
> this one?

Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
official Emacs themes for a start, WDYT?
-- 
Manuel Giraud

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 61816@debbugs.gnu.org
> Date: Thu, 02 Mar 2023 16:40:53 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> [...]
> 
> > You are right, of course.  It just feels strange to need to cater to
> > themes in a core package, when the way themes are supposed to
> > customize Emacs exists and can be used in this case as well.
> >
> > Alternatively, maybe themes should have settings for features such as
> > this one?
> 
> Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
> official Emacs themes for a start, WDYT?

Isn't that what your original patch does?

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
>> official Emacs themes for a start, WDYT?
>
> Isn't that what your original patch does?

No my original patch just bypasses doc-view-svg-\(fore\|back\)ground and
retrieves the default face colors.

See my other message: I think that it is the way to go.
-- 
Manuel Giraud

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Manuel Giraud <manuel@ledu-giraud.fr> writes:

> Eli Zaretskii <eliz@gnu.org> writes:
>
> [...]
>
>> You are right, of course.  It just feels strange to need to cater to
>> themes in a core package, when the way themes are supposed to
>> customize Emacs exists and can be used in this case as well.
>>
>> Alternatively, maybe themes should have settings for features such as
>> this one?
>
> Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
> official Emacs themes for a start, WDYT?

... and in order to be able to use 'custom-theme-set-faces', we could
have a 'doc-view-svg-face' (used only for its foreground and
background).  I'm caching you up slowly 😅
-- 
Manuel Giraud

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 61816@debbugs.gnu.org
> Date: Thu, 02 Mar 2023 16:51:59 +0100
> 
> Manuel Giraud <manuel@ledu-giraud.fr> writes:
> 
> > Eli Zaretskii <eliz@gnu.org> writes:
> >
> > [...]
> >
> >> You are right, of course.  It just feels strange to need to cater to
> >> themes in a core package, when the way themes are supposed to
> >> customize Emacs exists and can be used in this case as well.
> >>
> >> Alternatively, maybe themes should have settings for features such as
> >> this one?
> >
> > Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
> > official Emacs themes for a start, WDYT?
> 
> ... and in order to be able to use 'custom-theme-set-faces', we could
> have a 'doc-view-svg-face' (used only for its foreground and
> background).  I'm caching you up slowly 😅

Fine by me, that's what I proposed.

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

[-- Attachment #1: Type: text/plain, Size: 177 bytes --]

Eli Zaretskii <eliz@gnu.org> writes:

[...]

> Fine by me, that's what I proposed.

Wow, it is cleaner and works even better (no need to change page to
update colors).  Thanks.

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-Use-a-face-for-DocView-SVG.patch --]
[-- Type: text/x-patch, Size: 2609 bytes --]

From 0f3ff5af9610fbf173f07218d652c1be3477dc14 Mon Sep 17 00:00:00 2001
From: Manuel Giraud <manuel@ledu-giraud.fr>
Date: Thu, 2 Mar 2023 19:16:19 +0100
Subject: [PATCH] Use a face for DocView SVG

* lisp/doc-view.el (doc-view-svg-face): New face for SVG images.
(doc-view-insert-image): Use it.
---
 etc/NEWS         |  6 ++++++
 lisp/doc-view.el | 19 ++++++++-----------
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 116b60d8b11..88c3f2f0ef4 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -208,6 +208,12 @@ bound to 'C-c C-d' in 'go-ts-mode'.
 When this is non-nil, call the 'man' program synchronously rather than
 asynchronously (which is the default behavior).
 
+** DocView
+
+---
+*** New face 'doc-view-svg-face'.
+This replaces 'doc-view-svg-foreground' and 'doc-view-svg-background'.
+
 \f
 * New Modes and Packages in Emacs 30.1
 
diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index 0303fec67a6..b14655fb274 100644
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -236,17 +236,14 @@ doc-view-imenu-flatten
   :type 'boolean
   :version "29.1")
 
-(defcustom doc-view-svg-background "white"
-  "Background color for svg images.
+(defface doc-view-svg-face '((t :inherit default))
+  "Face used for SVG images.  Only background and foreground colors
+are used.
 See `doc-view-mupdf-use-svg'."
-  :type 'color
-  :version "29.1")
+  :version "30.1")
 
-(defcustom doc-view-svg-foreground "black"
-  "Foreground color for svg images.
-See `doc-view-mupdf-use-svg'."
-  :type 'color
-  :version "29.1")
+(make-obsolete 'doc-view-svg-background 'doc-view-svg-face "30.1")
+(make-obsolete 'doc-view-svg-foreground 'doc-view-svg-face "30.1")
 
 (defcustom doc-view-ghostscript-options
   '("-dSAFER" ;; Avoid security problems when rendering files from untrusted
@@ -1602,8 +1599,8 @@ doc-view-insert-image
                           (unless (member :transform-smoothing args)
                             (setq args `(,@args :transform-smoothing t)))
                           (when (eq doc-view--image-type 'svg)
-                            (setq args `(,@args :background ,doc-view-svg-background
-                                               :foreground ,doc-view-svg-foreground)))
+                            (setq args `(,@args :background ,(face-background 'doc-view-svg-face)
+                                                :foreground ,(face-foreground 'doc-view-svg-face))))
 			  (apply #'create-image file doc-view--image-type nil args))))
 	     (slice (doc-view-current-slice))
 	     (img-width (and image (car (image-size image))))
-- 
2.39.1


[-- Attachment #3: Type: text/plain, Size: 18 bytes --]

-- 
Manuel Giraud

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 61816@debbugs.gnu.org
> Date: Thu, 02 Mar 2023 19:20:30 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> [...]
> 
> > Fine by me, that's what I proposed.
> 
> Wow, it is cleaner and works even better (no need to change page to
> update colors).  Thanks.

Thanks, installed on master.

Btw, please in the future try to mention in the log message the bug
number, if it's known when you submit the patch.  That avoids the need
for me to fix the log message manually before pushing.

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Visuwesh]

[வியாழன் மார்ச் 02, 2023] Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> Manuel Giraud <manuel@ledu-giraud.fr> writes:
>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> [...]
>>
>>> You are right, of course.  It just feels strange to need to cater to
>>> themes in a core package, when the way themes are supposed to
>>> customize Emacs exists and can be used in this case as well.
>>>
>>> Alternatively, maybe themes should have settings for features such as
>>> this one?
>>
>> Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
>> official Emacs themes for a start, WDYT?
>
> ... and in order to be able to use 'custom-theme-set-faces', we could
> have a 'doc-view-svg-face' (used only for its foreground and
> background).  I'm caching you up slowly 😅

Themes can also use `custom-theme-set-variables' so I did not see a need
to introduce a face when I made the patch back then.

bug#61816: 30.0.50; [PATCH] New user option 'doc-view-svg-honor-theme'

[Eli Zaretskii]

> From: Visuwesh <visuweshm@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  61816@debbugs.gnu.org
> Date: Fri, 03 Mar 2023 07:58:07 +0530
> 
> [வியாழன் மார்ச் 02, 2023] Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:
> 
> > Manuel Giraud <manuel@ledu-giraud.fr> writes:
> >
> >> Eli Zaretskii <eliz@gnu.org> writes:
> >>
> >> [...]
> >>
> >>> You are right, of course.  It just feels strange to need to cater to
> >>> themes in a core package, when the way themes are supposed to
> >>> customize Emacs exists and can be used in this case as well.
> >>>
> >>> Alternatively, maybe themes should have settings for features such as
> >>> this one?
> >>
> >> Maybe, we could customize doc-view-svg-\(fore\|back\)ground in the
> >> official Emacs themes for a start, WDYT?
> >
> > ... and in order to be able to use 'custom-theme-set-faces', we could
> > have a 'doc-view-svg-face' (used only for its foreground and
> > background).  I'm caching you up slowly 😅
> 
> Themes can also use `custom-theme-set-variables' so I did not see a need
> to introduce a face when I made the patch back then.

The problem with custom-theme-set-variables is that themes have no
clue which variables to customize: there are too many of them, and
those that themes should customize don't stand out in any way, do
they?

Faces are better because themes always pay attention to them.